[roll] Roll fuchsia [carnelian] Expose fuchsia.ui.app.ViewProvider

This CL updates the example v2 components' manifest
to expose the protocols `fuchsia.ui.app.ViewProvider`
and `test.placeholders.Echo`. All example components
provide the former, while some provide the latter.

Original-Bug: 100933

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/692122
Original-Revision: acb9dce647edbc39eba6b3e3737837a7c4758087
GitOrigin-RevId: d1481f02bc533d4f530d4813eebccd464fa724ff
Change-Id: I62531673d0aa5fb22d76ce19b140109b270afb99
diff --git a/stem b/stem
index af1d267..2b0d58b 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="2a5933035105a6100146d0eab6a92182af5f5a8c"/>
+             revision="acb9dce647edbc39eba6b3e3737837a7c4758087"/>
   </projects>
   <hooks>
     <hook name="install-environment"